How can I extra Metadata from LPR analytics. I understand that Metadata can be from a device or system generated from analytics. I have an LPR running using Stable FPS Metadata driver, I idea is to extract metadata from the analytics event I have configured (alert for a plate match). For some odd reason I dont find any data created under metadata though the analytics plate match works fine.
This is part of a metadata extraction demo.
Appreciate any help.
In Milestone XProtect Analytics Events and Metadata are two completely different things.
An analytics event can be read using the Alarm and Event Viewer sample.
A metadata chunk of data can be read using the Metadata Live Viewer sample.
Some notes on metadata versus analytics events.
Metadata
Metadata is information that gets stored in the recorder database. It is often a stream of information form the camera directly or from video analytics performed on a camera stream but can be any kind of information flowing in.
Analytics Events
Analytics Events are events, events triggered by video analytics or any kind of event in the surrounding of a surveillance site. Analytics Events are stored by the Event Server in the SQL Server used by the XProtect VMS.
Comparison
Metadata can be stored at a very high frequency, utilizing the recorder database which also holds video and audio, it is no problem to update metadata at video framerate frequency or even faster. Analytics events are stored in SQL Server and the frequency should be kept low.
When metadata is stored in the highly specialized recorder database the constraint is that the data must be stored chronologically; when you have stored one metadata record you cannot later store another metadata record before (timestamp) the first one.
Once a metadata record or analytics event has been stored it cannot be changed.
Analytics Events can be retrieved in a fashion where it is possible filter on fields in the event, metadata can be retrieved by the timestamp.
The Smart Client can show metadata bounding boxes directly on the camera view in live and in playback mode. Both metadata and analytics event bounding boxes can be shown in the alarm preview in the Alarm Manager workspace in the Smart Client. It is possible to develop a Smart Client plugin that can show more data from either metadata or analytics events.